Abstract
In this paper, the three-dimensional bowl surface was obtained by reasonably planning the radial heating path by taking the laser as the heat source and the stainless steel composite plate (06Cr19Ni10/1Cr17Mn6Ni5N/06Cr19Ni10) as the research object, and the forming process of the three-dimensional bowl surface was studied. It was found that the target surface bending forming obtained by inside-outside symmetric scanning strategy (strategy d) had the highest accuracy. The plate deformation increased with the increase of laser power (P), increased then decreased with the increase of heating line length (L), and decreased with the increase of scanning speed (V). Moreover, the deformation was approximately linear with the number of repeated heating (N), with the optimal process conditions of P = 500 W, V = 10 mm/s, L = 20 mm, N = 7. A three-dimensional thermodynamic coupling model of a three-layer composite plate was established and verified experimentally.
Highlights
With the help of laser heat source, laser forming forms a temperature gradient in the material thickness direction, which in turn induces heterogeneous thermal stress
Research on laser forming mainly focused on two-dimensional single curvature forming of metallic materials
Stress increased with the increase of laser power P and heating times N, and decreased with the increase of scanning speed V, spot diameter D, and plate thickness T, the bending angle was predicted by neural network
Summary
With the help of laser heat source, laser forming forms a temperature gradient in the material thickness direction, which in turn induces heterogeneous thermal stress. Kalvettukaran et al [7] studied the effect of cooling mode on bending angle in laser forming process by numerical simulation. It was found that the temperature difference between upper and lower surfaces of plate could be significantly increased by water cooling mode, and the bending angle could be increased by 2%. It is found that when the surface temperature on the material was the same, there was increased bending angle of lime coated material, and the angle decreased with the increase of coating thickness. Biplab et al [9] obtained the optimum forming process by Taguchi method and ANOVA. Under this process, the maximum bending angle of the plate was 5.1°. After fully studying the three mechanisms of laser shaping (TGM, BM, UM), Shi et al [10] proposed a coupling mechanism (CM) on this basis, which could simultaneously underwent bending deformation with in-plane deformation
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